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<p>FeSiBCuNb/FeNi composite magnetic powder cores (CMPCs) with outstanding high-frequency permeability and low core loss (<i>P</i><sub>cv</sub>) have been developed by hybridizing HNO<sub>3</sub>-passivated Fe<sub>73.5</sub>Cu<sub>1</sub>Nb<sub>3</sub>Si<sub>13.5</sub>B<sub>9</sub> nanocrystalline powder with finer Fe<sub>50</sub>Ni<sub>50</sub> powder. A 7 wt.% HNO<sub>3</sub> passivation treatment forms a Fe<sub>3</sub>O<sub>4</sub>-dominant oxidation layer on the nanocrystalline powder surface, which increases its electrical resistivity and reduces the <i>P</i><sub>cv</sub> of the power cores. As FeNi content increases from 0 to 40 wt.%, the porosity of the CMPCs decreases consistently, while saturation magnetization (<i>M</i><sub>s</sub>), effective permeability (<i>μ</i><sub>e</sub>), and <i>P</i><sub>cv</sub> gradually enhance. An appropriate increase in compaction pressure further decreases the porosity and leads to enhanced <i>M</i><sub>s</sub>,<i>μ</i><sub>e</sub>, and lowered <i>P</i><sub>cv</sub>. The CMPC with 40 wt.% FeNi, compacted at 1000 MPa, exhibits the best comprehensive soft magnetic properties with <i>M</i><sub>s</sub>,<i>μ</i><sub>e</sub>, and <i>P</i><sub>cv</sub> at 50 mT/200 kHz of 136.3 emu/g, 57.4, and 599 mW/cm<sup>3</sup>, respectively. The improved <i>M</i><sub>s</sub> and<i>μ</i><sub>e</sub> result from the reduced porosity combined with the FeNi’s inherently higher <i>M</i><sub>s</sub> and<i>μ</i><sub>e</sub>. The increased high-frequency <i>P</i><sub>cv</sub> after FeNi addition mainly arises from the raised eddy loss due to decreased electrical resistivity. The reduced <i>P</i><sub>cv</sub> through the optimal compaction pressure is due to the further elimination of pore defects in the CMPCs.</p>

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Enhancing high-frequency soft magnetic performance of Fe-Si-B-Cu-Nb nanocrystalline alloy powder cores via hybridizing with FeNi

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • Tuo Feng,
  • Mao Cheng,
  • Yanhui Li,
  • Yibing Zhang,
  • Li Jiang,
  • Lu Yang,
  • Wei Zhang

摘要

FeSiBCuNb/FeNi composite magnetic powder cores (CMPCs) with outstanding high-frequency permeability and low core loss (Pcv) have been developed by hybridizing HNO3-passivated Fe73.5Cu1Nb3Si13.5B9 nanocrystalline powder with finer Fe50Ni50 powder. A 7 wt.% HNO3 passivation treatment forms a Fe3O4-dominant oxidation layer on the nanocrystalline powder surface, which increases its electrical resistivity and reduces the Pcv of the power cores. As FeNi content increases from 0 to 40 wt.%, the porosity of the CMPCs decreases consistently, while saturation magnetization (Ms), effective permeability (μe), and Pcv gradually enhance. An appropriate increase in compaction pressure further decreases the porosity and leads to enhanced Ms,μe, and lowered Pcv. The CMPC with 40 wt.% FeNi, compacted at 1000 MPa, exhibits the best comprehensive soft magnetic properties with Ms,μe, and Pcv at 50 mT/200 kHz of 136.3 emu/g, 57.4, and 599 mW/cm3, respectively. The improved Ms andμe result from the reduced porosity combined with the FeNi’s inherently higher Ms andμe. The increased high-frequency Pcv after FeNi addition mainly arises from the raised eddy loss due to decreased electrical resistivity. The reduced Pcv through the optimal compaction pressure is due to the further elimination of pore defects in the CMPCs.